They are generally round but stretch longer along one axis than along the other.
总体上它们是圆的，但沿一根轴比另一根轴延伸得要更长一些。
Unit vectors are always pointing in the direction of the positive axis x in the x direction is this one.
单位矢量,始终指向,轴的正方向,轴方向的单位矢量，and，the，unit，vector,是这个。
Sliders are often a better option, because they visually suggest the fact that movement is along just one axis .
滑块常常是更好的选择，因为外表看起来它们就像是可以在一个维度上移动的。
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